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∑ a^2 (b^2 - b c + c^2) (b^2 + b c + c^2) (y - z) y z = 0

X(2), X(3), X(6), X(76), X(262), X(982), X(984), X(3061), X(3094), X(3117)

vertices of the medial triangle

Geometric properties :

K252 and K1012 are two strong pKs with pivot X(2) anharmonically equivalent to K020. See Table 66.

More generally, any pK(Ω, X2) with pole Ω on the circum-conic passing through X(2), X(1691), X(3094) is also anharmonically equivalent to K020.